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-rw-r--r--canvas/source/tools/page.cxx135
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diff --git a/canvas/source/tools/page.cxx b/canvas/source/tools/page.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include "page.hxx"
+
+namespace canvas
+{
+ Page::Page( const std::shared_ptr<IRenderModule> &rRenderModule ) :
+ mpRenderModule(rRenderModule),
+ mpSurface(rRenderModule->createSurface(::basegfx::B2ISize()))
+ {
+ }
+
+ void Page::validate()
+ {
+ if(!(isValid()))
+ {
+ for( const auto& rFragmentPtr : mpFragments )
+ rFragmentPtr->refresh();
+ }
+ }
+
+ bool Page::isValid() const
+ {
+ return mpSurface && mpSurface->isValid();
+ }
+
+ FragmentSharedPtr Page::allocateSpace( const ::basegfx::B2ISize& rSize )
+ {
+ SurfaceRect rect(rSize);
+ if(insert(rect))
+ {
+ FragmentSharedPtr pFragment = std::make_shared<PageFragment>(rect,this);
+ mpFragments.push_back(pFragment);
+ return pFragment;
+ }
+
+ return FragmentSharedPtr();
+ }
+
+ bool Page::nakedFragment( const FragmentSharedPtr& pFragment )
+ {
+ SurfaceRect rect(pFragment->getSize());
+ if(insert(rect))
+ {
+ pFragment->setPage(this);
+ mpFragments.push_back(pFragment);
+ return true;
+ }
+
+ return false;
+ }
+
+ void Page::free( const FragmentSharedPtr& pFragment )
+ {
+ // the fragment passes as argument is no longer
+ // dedicated to this page. either it is about to
+ // be relocated to some other page or it will
+ // currently be deleted. in either case, simply
+ // remove the reference from our internal storage.
+ FragmentContainer_t::iterator it(
+ std::remove(
+ mpFragments.begin(),mpFragments.end(),pFragment));
+ mpFragments.erase(it,mpFragments.end());
+ }
+
+ bool Page::insert( SurfaceRect& r )
+ {
+ for( const auto& pFragment : mpFragments )
+ {
+ const SurfaceRect &rect = pFragment->getRect();
+ const sal_Int32 x = rect.maPos.getX();
+ const sal_Int32 y = rect.maPos.getY();
+ // to avoid interpolation artifacts from other textures,
+ // one pixel gap between them
+ const sal_Int32 w = rect.maSize.getX()+1;
+ const sal_Int32 h = rect.maSize.getY()+1;
+
+ // probe location to the right
+ r.maPos.setX(x+w);
+ r.maPos.setY(y);
+ if(isValidLocation(r))
+ return true;
+
+ // probe location at bottom
+ r.maPos.setX(x);
+ r.maPos.setY(y+h);
+ if(isValidLocation(r))
+ return true;
+ }
+
+ r.maPos.setX(0);
+ r.maPos.setY(0);
+
+ return isValidLocation(r);
+ }
+
+ bool Page::isValidLocation( const SurfaceRect& r ) const
+ {
+ // the rectangle passed as argument has a valid
+ // location if and only if there's no intersection
+ // with existing areas.
+ SurfaceRect aBoundary(mpRenderModule->getPageSize());
+ if( !r.inside(aBoundary) )
+ return false;
+
+ for( const auto& pFragment : mpFragments )
+ {
+ if( r.intersection( pFragment->getRect() ) )
+ return false;
+ }
+
+ return true;
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */